Mounting the motors

Hey guys

I recently bought a frame with 16mm and 19mm mounting holes, however the motors I bought along have holes 19mm all the way long. Is it okay to mount with just 2 screws or should have all the screws in place to fly my quad
 
Hi I have many times mounted motors with just 2 bolts that was on an alloy mount , I would worry a bit more of its carbon frame and your going to fly very hard and put the frame into stress more often
 
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